Method and system for control power in remote DC power systems
First Claim
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1. A control power supply system comprising:
- a first conductor configured to carry, a direct current (DC) electrical current from a source to a load;
a second conductor configured to carry the DC electrical current from the load to the source;
a plurality of diodes coupled in series with at least one of the first conductor and the second conductor, wherein the plurality of diodes is configured to fail in a shorted condition such that failure of the plurality of diodes maintains a direct current (DC) ring bus; and
an AC power source coupled to at least one of said first and said second conductors, said AC power source configured to superimpose a selectable relatively high frequency AC component onto said DC electrical current to generate a composite power signal.
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Abstract
A method and system for a control power supply system is provided. The control power supply system includes a first conductor configured to carry a direct current (DC) electrical current from a source to a load, a second conductor configured to carry the DC electrical current from the load to the source, and an AC power source coupled to at least one of the first and the second conductors, the AC power source configured to superimpose a selectable relatively high frequency AC component onto the DC electrical current to generate a composite power signal.
20 Citations
12 Claims
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1. A control power supply system comprising:
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a first conductor configured to carry, a direct current (DC) electrical current from a source to a load; a second conductor configured to carry the DC electrical current from the load to the source; a plurality of diodes coupled in series with at least one of the first conductor and the second conductor, wherein the plurality of diodes is configured to fail in a shorted condition such that failure of the plurality of diodes maintains a direct current (DC) ring bus; and an AC power source coupled to at least one of said first and said second conductors, said AC power source configured to superimpose a selectable relatively high frequency AC component onto said DC electrical current to generate a composite power signal. - View Dependent Claims (2, 3)
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4. A control power supply system comprising:
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a first conductor configured to carry a direct current (DC) electrical current from a source to a load; a second conductor configured to carry the DC electrical current from the load to ti source; a plurality of diodes coupled in series with at least one of the first conductor and the second conductor, wherein the plurality of diodes is configured to fail in a shorted condition such that failure of the plurality of diodes maintains a direct current (DC) ring bus; a buck converter configured to step-down voltage using a plurality of semiconductor switches, wherein the plurality of semiconductor switches generates an AC ripple current by switching action; and a ripple filter electrically coupled to an output of said buck converter, said ripple filter configured to filter the AC ripple component of the output of said buck converter and transmit the filtered output to a control and auxiliary supply system. - View Dependent Claims (5)
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6. A method of supplying a control power supply from a DC power cable, said method comprising:
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superimposing an AC control power supply voltage onto a DC power cable at a sending station end; extracting the superimposed AC control power supply voltage from the DC power cable at a load station end, wherein a plurality of diodes is coupled in series with the DC power cable, wherein the plurality of diodes is configured to fail in a shorted condition such that failure of the plurality of diodes maintains a direct current (DC) ring bus; and transmitting the AC control power supply voltage to the control power supply.
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7. A power supply system for subsea loads, said power supply system comprising:
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a sending station coupled to a first end of a DC power cable, said sending station positioned above a sea surface and configured to direct a flow of DC current into said DC power cable; a load station coupled to a second end of the DC power cable, said load station positioned below said sea surface and configured to receive the flow of DC current and transmit the DC current to one or more loads; a plurality of diodes coupled in series with the DC power cable, wherein the plurality of diodes is configured to fail in a shorted condition such that failure of the plurality of diodes maintains a direct current (DC) ring bus using the DC power cable; and a control power supply system powered from said DC power cable proximate to said load station and configured to provide a DC voltage supply to a control power circuit. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification